The 258 (4.2l) Harmonic balancer will not fit on the 242 (4.0l). 
The groves for the serp belt do not line up. 
Harmonic Balancer fitment
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akadeutsch
- Movin on up ^
- Posts: 314
- Joined: February 22nd, 2014, 7:27 pm
- Stroker Displacement: 4.6
- Vehicle Year: 1981
- Vehicle Make: Jeep
- Vehicle Model: CJ8
- Location: New Prague, MN
Harmonic Balancer fitment
The 258 (4.2l) Harmonic balancer will not fit on the 242 (4.0l). The groves for the serp belt do not line up. -
akadeutsch
- Movin on up ^
- Posts: 314
- Joined: February 22nd, 2014, 7:27 pm
- Stroker Displacement: 4.6
- Vehicle Year: 1981
- Vehicle Make: Jeep
- Vehicle Model: CJ8
- Location: New Prague, MN
Re: Harmonic Balancer fitment
This is a picture of the 258 HB on my 242. If you look close you can tell that the groves do not line up.
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SilverXJ
- Global Moderator
- Posts: 5790
- Joined: February 14th, 2008, 7:14 am
- Stroker Displacement: 4.6L
- Vehicle Year: 2000
- Vehicle Make: Jeep
- Vehicle Model: Cherokee
- Location: Radford, Va
Re: Harmonic Balancer fitment
That 4.0L balancer also doesn't have that 'bevel' on the front of it... Besides the grooves being too far forward.
2000 XJ. 4.6L stroker
00+ Viper Coil Swap | CPS Timing Increase Mod | Fabricated Airbox | Dash bezel, Arduino Multigauge & RD Conceal
Eat, breath, drink, sleep, Jeep, drink
00+ Viper Coil Swap | CPS Timing Increase Mod | Fabricated Airbox | Dash bezel, Arduino Multigauge & RD Conceal
Eat, breath, drink, sleep, Jeep, drink
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